1 Department of Urology, Western General Hospital, NHS Lothian, Edinburgh, UK; Department of Urology, Churchill Hospital, Oxford University Hospitals, Oxford, UK. Electronic address: abhishek.sharma@ouh.nhs.uk.
2 Department of Urology, Western General Hospital, NHS Lothian, Edinburgh, UK.
3 Department of Urology, Western General Hospital, NHS Lothian, Edinburgh, UK; College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, UK.